Machine for edging glass sheets



July 7, 1936. w. OWEN 2,046,405

MACHINE FOR EDGING GLASS SHEETS Filed May 51, 1955 Sheets-Sheet 1 IN VEN TOR MLLJHM OWEN g/(Maw, 7" M A TTORNEYS.

w. OWEN July 7, 1936.

MACHINE FOR EDGING GLASS SHEETS Filed May 51, 1955 5 Sheets-Sheet 3 r @CQ/ ATTORNEYS.

M m L m W July 7, 1936. w. OWEN MACHINE FOR EDGING GLASS SHEETS I Filed May 51, 1935 5 Sheets-Sheet 4 INVEN TOR. Wu. 1.. [HM OWEN 7 5a ATTORNEYS.

July 7, 1936. w, WE v 2,046,405

MACHINE FOR EDGING GLASS SHEETS 1 7 Filed May 51, 1955 5 Sheets-Sheet 5 l/VVENTOR YVlL-LJHM GWEN H TTORNE VS.

Patented July 7, 1936 1 UNITED "STATES 2,046,405 MACHINE FOR VEDGIN'G GLASS SHEETS William Owen, Pittsburgh, Pa., assignor to Pittsburgh Plate Glass Company, a. corporation. of

Pennsylvania Application May 31, 1935, Serial No. 24,383

'9 Claims.

The invention relates to apparatus for grinding the edges of glass sheets ordinarily to give them the half round or pencil edge required for automobile glass, and the apparatus herein shown and described constitutes an improvement on the apparatus of my application for patent, .Serial No. 7,824, filed'February 23, I935. The invention is illustrated as applied to plates or sheets of safety glass consisting of two sheets of glass cemented to an interposed sheet of celluloid or the like, but.

the machine is equally well adapted for grinding the edges of sheets of ordinary ,plateglass and for edging sheets designed for service other than as automobile glass. The'inventionhas for itsprincipal objects the provision of a machine of the general type shown in my application above referred to having improved means for maintaining the-sheets in grinding engagement with thegrinding wheel and steadyingthem, and the provision of means whereby the sheets may be ground in matched pairs, thus increasing the capacity of the machine and avoiding the concentration of grinding pressure on those corners of the sheet which are relatively sharp, which tends to cause zbreakageof such .corners when such expedient is not employed. A .further object is the simplification and cheapening of the apparatus of my previous application. Certain embodiments of I the invention are illustratedin the accompanying drawings, wherein:

Figure 1 is a side elevation of the machine. Fig. 2 is an end elevation. Fig. .3 is a section on the line III-III of Fig .1, but with the glass plates rotated 90 degrees from the position shown in Fig. 1. Figs. 4,5 and Bare detail views. And Figs. 7 and 8 .are'side elevations showing twomodifications.

Referring to the drawings, the framework of the machine shown in Figs. 1 and 2 comprises a pair of channels I, 1, pairs of uprights .3, 3 and 4,, 4, and ,a transverse top section consisting of the angles 5 and =6, the frame members being suitably secured together ina rigid framework by means of bolts or rivets. -A closure ,member I preferably of light metal prevents waterirom .be-

ing thrown to the left (Fig. .1) during the .grinding operation, the water beingsupp'lied to the grinding wheel by means of the spray ,pipes 8, 8. KO A grooved edging or grinding wheel 8 is suitably mounted in the upper portion of the framework upon the shaft of .the electric motor 40.. .As in the construction of my application heretofore .re-

ferred to, .the plates to be edged are carried in a 5 loop H 10f the belt member I2, such loop being located beneath the grinding wheel and forced side bars 34 of alternate links are provided with upward by suitable means so as to secure the necessary grinding pressure between the edges of the glass plates'and the grindingwheel. The belt I2 is preferably in the form of a sprocket chain of theconstruction indicated in Figs; 3 and 5, such chain passing around the sprockets l3, l4, l5, l6 and I1. The sprockets l5 and I6 are mounted in fixed position upon the transverse frame member 6, a plurality of holes for the shafts of the sprockets being provided to permit of adjustment in the position of the sprockets, The sprocket l4 provides the drive for the chain, being keyed to the shaft of the electric motor l8, which is bolted to the upright frame members 3. The sprocket I 3.acts as a tensioning means for the 5 chain and assists in. pulling the loop ll upward toward the grinding wheel. This sprocket 'is mounted upon the lever arm l9 pivoted at 2%] to a bracket 2| secured to the upperends of the frame members 3 .and 4. The lever arm is counter- 2 weighted by means of the weight 22 which is .adjustable longitudinally of the lever by means of the screw 23. .A spring 24 secured at oneend to the lever arm and at the other end' to a bracket 25 supplements the action of the counterweight. 2

In operation, the grinding wheel 9, and the work which is carriedby the loop are rotated in a counterclockwise direction, as indicated by the arrows, and the force which is thus applied to the edge of the work tendsto swingthe work to the right. This tendency is counteracted and the work is steadied by means of a sprocket 26 carried upon the bracket 21, such bracket being adjustable in a horizontal direction by means of the boltand slot connection with the iramemembers 3, 4, as indicated at 29 .and 38. In order to supplement the action of the lever l9 in' pulling the loop H upward and thus give the necessary grinding pressure between the edge of the work, and the grinding wheel, a lever 3| is provided carrying at one end the sprocket wheel 32fenga'gwings 35 which serve to support the continuous grooved rubber strips 36 and "31, in which the edges .of the glass sheets fit, the stripsbe'ing secured to the wings by means of the rivets 38. The strips ,are coextensive in length with the chain and give a secure support for the edges of the glasssheets, their flanges serving to prevent any lateral movement of such edges so'that the glass sheets are securely maintained in alignment with the grooves 39 in the grinding wheel.

As will be seen by reference to Figs. 1 and '3,

.the'arrangement' permits of the grinding of the edges of four similar sheets of'glass'at one time."

The sheets. and 4! strain the present instance,

side lights which are of greater length than width withthe longest sides of the plates in opposition and secured in such position by meansof suitable clamping means. This clamping means preferably comprises the central strip and the two 7 side strips 43 and 44 having the cross section indicated in'Fig. 3 and secured in assembledrelation by means of a pair of bolts 45 carrying the wing nuts 45 at one end. Thisarrangement of grinding the sheets in'pairs increases the capacity of the machine and rendersthe operation more satisfactory than is thecase. where the sheets are not placed 'edgeto edge, since by this of the grinding wheel and interferewith its operation, and in order to keep these grooves clean,

scraping devices'may be employed, as indicated in Fig. 4. As here shown, the stripIflis provided at its "end with longitudinal recesses inwhich strips of, glass 19, 4 9 are mounted, such Sstrips being backed up by springs 49o. In operation these glass strips scrape the grooves in the grindingwheel when the work reaches the position in dicatedin Fig. 1, thus tending to keep the grooves V clear'from an accumulation of plastic.

Fig. 7 illustratesa.modification wherein th e loop 50 of the belt which carriesthe work :is pressed upward intoengagement'with the grinding wheel'5l by means of the pair ofsprcckets' 52, 52 carried upon an arm.52a. otally mounted at 53 upona lever 53a counter- V 7 weighted by means of the weight 54; The chain gee istens'ioned in this instance by'means of the counterweighted lever 54a having a sprocket 55 around which the chain passes. The 'cha'in is here driven from the 'sprocketf56 Whichis carried upon'theshaft of themotor 56a. The chain is guided in this case by three additional sprockets 51, 51a and 58, suitably supported upon the framework 580 of the machine. 7 i V 7 Fig. 8 illustrates a modification in which the edging is accomplished by a pair l'of grinding wheels '59 and 60 mounted in, the frame. 6] and suitably driven by motors 59a and. 60a. The

loop;62 which carries the work is pressed upward by sprockets 63 and 64 carried upon the counterweighted levers 65 and 66. .The chain is preferably tensioned by means of the'sprocket 61 car;

ried upon the lever arms 68, such lever arm being keyed" to the shaft '69 which carries-the Other sprocket wheels counterweighted lever 10.. 1|, 12, 13., 14 and'l5 are employed for suitably guiding the chain. The chain is driven'by the motor 16, on whose shaft is. mounted a sprocket 11 over which the *chain passes. What I claim is: 1 1. A glass plate edging machine comprising a driven grooved grinding wheelhaving a horizontal axis, an endless driven belt lying in the same,

This arm is pivf -of the glass plate, tor holdingit in irotation of the grinding wheeL;

.wheelpartiallyflsurrounding; the glass plate to be edged, anfidle fj-wheellocatedabove the axis of rotation of gthe grinding wheel over which the fiangesglying on eachside ef theglass plate for plane as the wheel and havinga loop below the wheel partially surroundingzthe glass plate to be edged, means for tensioning the belt, and rotating means engaging the lower portion of said loop A and yieldingly'pressing the loop and glass plate: carried thereby upward to secure grinding pressure of the edge of 'such plate upon thegrinding wheel, the belt being. provided with flanges lying on each side of the glass plate for holding it in the plane of rotation of the grinding wheel.

' 2. A glass plate edging machine comprising a driven grooved grinding wheel having ahorizontalaxis,'an' endless driven belt in the form of a sprocket chain lying in the same plane as the wheel and having a loop below the wheel partially 1 surrounding the glass plate to be edged, means for: tensioning the chain, and a sprocket engaging the loop portion, of the chain and yieldingly' pressed upward to cause grindingpressure between-thev edge of the glass plate and the grind-.

ing wheel',.'the chain being provided with flanges lying on-eachlside of the-glass'plate for holding,

it intheplane of rotation pr the wheel.'

3. .A (glass plate edging machine comprising a-driven grooved grinding wheel having a hori- 'zontal axis, anfendless' driven belt lying in the 7 same plane as the wheeland having a loop below s i the wheel Jpartiallysurr ounding the glass plate 1 to be edged, means, for. .tensioningthe belt, a;

steadywheel, at one'side hi the loopto prevent 3O such loop from being swung laterally due to the grinding engagement between'the grinding wheel and the glass sheet,;andawheel' 'engaging'the lower, portion of the loop and yieldingly pressed grinding wheel and the edgeof the glass plate,

of rotation f ,thegrinding wheel;

. 4. A glass plate edging machlnecomprising a driven (grooved grindingjwheelhaving a horizontalaxis, an endless drivenbelt lying in the same plane as the wheelandhaving a loop below i the wheelpartially surrounding the glass Pl 45 rotation of th'e grinding wheel cver which the to'be edged, a wheel located above the axis of belt passesf yiel-dinglypressed up'wardfor ten-- .fsioningnthebelt, and rotating means engaging upwardtojsecure grinding pressure between the-3 the belt being" provided with flanges lying oneach side of the, glass plate for holding it in the plane the lower portion otfsaid loop and yieldingly.

pressing theloop and glass plate carried-thereby of such'plateu'pon thegrinding wheel, the belt being provide'dyith flanges lyingfon each' side the plane. or;

plane asfthewheel andhaving a loop below the beltj lpasses 'yieldingly pressed upward for. ten

sioning. the belt, yielding means i engaging the T 7 lower portion of said. .loop-andpressing the loop fand glass, plate upward tosecure grinding pressure of the 'platefupon the grinding wheel, and,

. 50 upward itosecu're grinding pressure oi. the edge 2' 5; .A' glass plate'edging ma.chine comprising, v a driven grooved grinding wheel having a'hori- 'zontal I axis, ian endlesslgbelt lying inthe same driving means for the belt'interrnediate the idler J 7 wheel 'and saidiloopfthe belt being provided with holding 6. A glass driven grooved grinding wheel having a horiaontal axis,'-'an -endless driven belt lying in the itin the plane of rotation of the grind- 7 ing wheel. r

plate edging machine comprising a V same plane as the wheel and having a loop below the wheel partially surrounding the glass plate to be edged, means for tensioning the belt, and a pair of spaced wheels engaging the lower portion of said loop and yieldingly pressed upward to secure grinding pressure between the grinding wheel and the edge of the glass sheet, the belt being provided with flanges lying on each side of the glass plate for holding it in the plane of rotation of the grinding wheel.

7. A glass plate edging machine comprising a driven grooved grinding wheel having a horizontal axis, an endless driven belt lying in the same plane as the wheel and having a loop below the wheel partially surrounding the member to be edged, a clamp securing together the oppos ing long edges to two similar glass plates of greater length than width which-together constitute the member to be edged, and means engaging the belt and tending to move the loop upward so that the edge of said member is yieldingly held in engagement with the grinding wheel, the belt being provided with flanges lying on each side of said member for holding it in the plane of rotation of the grinding wheel.

8. A glass plate edging machine comprising a driven grooved grinding wheel having a horizontal axis, an endless driven belt lying in the same plane as the wheel and having a loop below the wheel partially surrounding the member to be edged, a clamp securing together the opposing long edges to two similar glass plates of greater length than width which together constitute the member to be edged, a scraper of hard material mounted in the end of the clamp for movement longitudinally thereof and yieldingly pressed outward, and means engaging the belt and tending to move the loop upward so that the edge of said member is yieldingly held in engagement with the grinding wheel, the belt being provided with flanges lying on each side of said member for holding it in the plane of rotation of the grinding wheel.

9. A glass plate edging machine comprising a driven grinding wheel having a horizontal axis and provided with a pair of peripheral grooves, an endless driven belt lying in the same plane as the wheel and having a loop below the wheel arranged to partially surround the glass plates to be edged, said belt comprising a sprocket chain with a continuous grooved rubber strip secured to each side thereof adapted to carry one of the glass plates, and means for tensioning the chain and causing the loop to maintain the sheets carried by the rubber strips in grinding engagement with the grooves in the wheel.

, WILLIAM OWEN. 

